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  2. HP-67/97 - Wikipedia

    en.wikipedia.org/wiki/HP-67/97

    In addition to software and support from HP, an active user community supported the HP-67/97 as well as the other HP programmables of the era. The group was called PPC and produced the PPC Journal . One of the notable contributions of the group was the development of a "Blackbox" that allowed pseudo-alphanumeric displays.

  3. GPS disciplined oscillator - Wikipedia

    en.wikipedia.org/wiki/GPS_disciplined_oscillator

    A GPS disciplined oscillator unit with a GPS antenna input, 10 MHz and 1 pulse-per-second (PPS) outputs, and an RS-232 interface.. A GPS clock, or GPS disciplined oscillator (GPSDO), is a combination of a GPS receiver and a high-quality, stable oscillator such as a quartz or rubidium oscillator whose output is controlled to agree with the signals broadcast by GPS or other GNSS satellites.

  4. Satellite navigation solution - Wikipedia

    en.wikipedia.org/wiki/Satellite_navigation_solution

    Satellite navigation solution for the receiver's position (geopositioning) involves an algorithm.In essence, a GNSS receiver measures the transmitting time of GNSS signals emitted from four or more GNSS satellites (giving the pseudorange) and these measurements are used to obtain its position (i.e., spatial coordinates) and reception time.

  5. GPS/INS - Wikipedia

    en.wikipedia.org/wiki/GPS/INS

    The GPS gives an absolute drift-free position value that can be used to reset the INS solution or can be blended with it by use of a mathematical algorithm, such as a Kalman filter. The angular orientation of the unit can be inferred from the series of position updates from the GPS.

  6. GNSS software-defined receiver - Wikipedia

    en.wikipedia.org/wiki/GNSS_software-defined_receiver

    A software GNSS receiver is a Global Navigation Satellite System (GNSS) receiver that has been designed and implemented using software-defined radio.. A GNSS receiver, in general, is an electronic device that receives and digitally processes the signals from a navigation satellite constellation in order to provide position, velocity and time (of the receiver).

  7. GPS week number rollover - Wikipedia

    en.wikipedia.org/wiki/GPS_week_number_rollover

    Software that is not coded to anticipate the rollover to zero may stop working or could be moved back in time by a multiple of approximately 20 years. GPS is not only used for positioning, but also for accurate time. Time is used to accurately synchronize payment operations, broadcasters, and mobile operators.

  8. HP 49/50 series - Wikipedia

    en.wikipedia.org/wiki/HP_49/50_series

    Previous versions of HPGCC supported the other ARM-based calculator models (the 48gII, and the hp 39g+/HP 39gs/HP 40gs), but this was removed due to lack of interest and compatibility issues. Formally, HPGCC is a cross-compiler ; it compiles code for the ARM-based HP calculators, but runs on a PC rather than the target system.

  9. HP 39/40 series - Wikipedia

    en.wikipedia.org/wiki/HP_39/40_series

    HP 40g (F1907A) was released in 2000 in parallel with the HP 39g. The HP 40g's operating system is identical to the HP 39g. Differences detected in hardware during start-up trigger the differences in software functionality. The hardware is identical to the HP 49G/39G series (complete with rubber keyboard).